Wireless telegraph or telephone system.



W. H. SHEPHARD & A. E. MGKEGHNIE.

WIRELESS TELEGRAPH 0R TELEPHONE SYSTEM APPLICATION FILED MAY7, 1914.

I 1,104,746, Patented July 21, 1914.

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UNITED STATES PATENT OFFICE.

WILLIAM HENRY SHEPHARD AND ARCHIBALD EDWARD MCKECHNIE, OF LONDON, ENGLAND.

WIRELESS TELEGRAPH OR TELEPHONE SYSTEM.

To all whom it may concern Be it known that we, WILLIAM HENRY SHEPHARD and ARCHIBALD EDWARD Mo- KEoHNIE, both subjects of the King of Great Britain, residing, respectively, at 3 Crown Court, Old Broad street, in the county of London, England, and 5 Colville Terrace, Bayswater, in the county of London, England, have invented certain new and useful Improvements in or Relating to Wireless Telegraph or Telephone Systems, of which the following is a specification.

This invention relates to wireless telegraph or telephone systems,

According to the invention we combine with an alarm device which gives an aural indication when the receiving apparatus is rendered operative, an inertia switch is so constructed that when the receiving circuit has been operative for a redetermined time as a result of the reception of calls, the switch effects the closing of the alarm circuit. When'the receiving circuit ceases to be operative, the switch automatically returns to its normal or zero position.

In order that the said invention may be clearly understood and readily carried into effect, we will describe the same more fully with reference to the accompanying drawings, in which Figure 1 is a diagram showing the invention applied to the receiving apparatus of a wireless telegraph station, and Figs. 2 and 3 are respectively an elevation and a plan of a constructional form of the switch.

Referring to Fig, 1, A is a metal ball arranged in an inclined trough A forming part of a switch arm A for the reception of a telephone receiver. This trough is provided with contacts which are adapted to be bridged by the ball A when the latter is released and cause a bell to ring. The said ball is held in the position shown by a spring controlled pivoted catch A under the influence of an electromagnet A arranged in a circuit controlled by the switch as will be hereinafter described. The above apparatus is only shown as one convenient for Specification of Letters Patent.

App1ication filed May 7, 1914.

Patented July 21, 1914.

Serial No. 837,075.

the application of our improved switch and may be replaced by another of suitable construction. f, f represent part of the wireless receiving circuit and Gr is a solenoid or electro-magnet in this circuit.

The inertia switch may as shown clearly in Figs. 2 and 3 take the form of a heavy wheel G which is preferably driven by a light spring 9* from a ratchet wheel G actuated by a pawl G attached to the armature G of the solenoid or magnet G brought into operation by the receiving circuit. The said wheel G and the ratchet wheel G are respectively provided with contacts g, g forming part of the circuit containing the electromagnet A. This arrangement is such that when the ratchet wheel G is moved a small amount, the two contacts 9, 9 will not come into engagement, but when the said wheel is moved a predetermined large amount the contacts will engage and the alarm will be operated. The spring 9" and the wheel G insure that when any lag takes place between the two wheels they will be returned to their normal relative position when the ratchet wheel G comes to rest.

What we claim and desire to secure by Letters Patent of the United States is In a circuit closer, the combination of a rotary inertia member, a second rotary member movable therewith, electric magnetic releasing means for said members, means for rotating said members when released, circuit terminals carried by said members respectively and a pair of contacts carried one on each of said rotating members adapted to engage when the second rotary member is stopped and the inertia member moves to a predetermined position, substantially as described.

In testimony whereof we aflix our signatures in presence of two witnesses.

WILLIAM HENRY SHEPHARD. ARGHIBALD EDWARD McKECHNIE.

\Vitnesses:

THOS. F. HARGREAVES, T. SELBY VVARDLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

